GLASS Russian patent published in 1994 - IPC

FIELD: glass materials. SUBSTANCE: glass has, wt.-%: silicon oxide (SiO₂) 73-75; aluminium oxide (Al₂O₃) 3-5; barium oxide (BaO) 0.5-2.5; magnesium oxide (MgO) 0.5-2; potassium oxide (K₂O) 0.5-3; sodium oxide (Na₂O) 4.5-6.5; boron oxide (B₂O₃) 11-15; lithium oxide (Li₂O) 0.1-0.5; copper oxide (Cu₂O) 0.5-5; one oxide from a group: antimony oxide, tin oxide, iron oxide, - Sb₂O₃, SnO₂, Fe₂O₃ 0.05-4. Glass thermal stability is 185-190 C. Glass is used for making of therostable articles. EFFECT: enhanced quality of glass. 1 tbl